If using MR-Base, the IEU GWAS database, or the TwoSampleMR R package
please cite:

  Hemani G, Zheng J, Elsworth B, Wade KH, Baird D, Haberland V, Laurin
  C, Burgess S, Bowden J, Langdon R, Tan VY, Yarmolinsky J, Shihab HA,
  Timpson NJ, Evans DM, Relton C, Martin RM, Davey Smith G, Gaunt TR,
  Haycock PC, The MR-Base Collaboration. The MR-Base platform supports
  systematic causal inference across the human phenome. eLife
  2018;7:e34408. doi: 10.7554/eLife.34408

A BibTeX entry for LaTeX users is

  @Article{twosamplemr,
    author = {G. Hemani and J. Zheng and B. Elsworth and K. Wade and D. Baird and V. Haberland and C. Laurin and S. Burgess and J. Bowden and R. Langdon and V.Y. Tan and J. Yarmolinsky and H.A. Shibab and N.J. Timpson and D.M. Evans and C. Relton and R.M. Martin and G. {Davey Smith} and T.R. Gaunt and P.C. Haycock and {The MR-Base Collaboration}},
    title = {The MR-Base platform supports systematic causal inference across the human phenome},
    year = {2018},
    volume = {7},
    journal = {eLife},
    pages = {e34408},
    url = {https://elifesciences.org/articles/34408},
    doi = {10.7554/eLife.34408},
  }

If also using the MR-Steiger test please cite:

  Hemani G, Tilling K, Davey Smith G (2017) Orienting the causal
  relationship between imprecisely measured traits using GWAS summary
  data. PLOS Genetics 13(11): e1007081.
  https://doi.org/10.1371/journal.pgen.1007081

A BibTeX entry for LaTeX users is

  @Article{mrsteiger,
    author = {G. Hemani and K. Tilling and G. {Davey Smith}},
    title = {Orienting the causal relationship between imprecisely measured traits using GWAS summary data},
    journal = {PLoS Genetics},
    year = {2017},
    volume = {13},
    number = {11},
    pages = {e1007081},
    doi = {10.1371/journal.pgen.1007081},
    url = {https://doi.org/10.1371/journal.pgen.1007081},
  }